Hello.
On 10-04-2012 7:46, Thang Nguyen wrote:
Hi Sergei,
Thanks for your review.
On Maui, there are 2 separate SATA controllers but they share the same
AHBDMA controller. Each SATA controller is assigned a fixed DMA channel on
the AHBDMA (channel 0 is assigned to SATA controller 0 and channel 1 is
assigned to SATA controller 1).
For the 460EX, there is only 1 SATA controller and it uses channel 0 for
transferring data.
In my opinion, in the case of Maui, we can use the same DMA information in
2 device nodes as they use the same DMA controller. And in another CPU, if
they use different DMA controller, the corresponding information will also
be different.
No, either the DMA controller should be a separate device node, or both
ports and DMA controller should be packed into the single device node. The way
you're doing it is incorrect because it creates memory resource conflict
between devices when they are instantiated as platfrom devices.
Regards,
Thang Nguyen -
-----Original Message-----
From: Sergei Shtylyov [mailto:sshtylyov@xxxxxxxxxx]
Sent: Monday, April 09, 2012 5:13 PM
To: Thang Q. Nguyen
Cc: Benjamin Herrenschmidt; Paul Mackerras; Jeff Garzik; Grant Likely; Rob
Herring; linuxppc-dev@xxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
linux-ide@xxxxxxxxxxxxxxx; devicetree-discuss@xxxxxxxxxxxxxxxx
Subject: Re: [PATCH 1/1] Add support 2 SATA ports for Maui and change
filename from sata_dwc_460ex.c to sata_dwc_4xx.c
Hello.
On 03-04-2012 14:12, Thang Q. Nguyen wrote:
Signed-off-by: Thang Q. Nguyen<tqnguyen@xxxxxxx>
[...]
diff --git a/arch/powerpc/boot/dts/bluestone.dts
b/arch/powerpc/boot/dts/bluestone.dts
index cfa23bf..803fda6 100644
--- a/arch/powerpc/boot/dts/bluestone.dts
+++ b/arch/powerpc/boot/dts/bluestone.dts
@@ -155,6 +155,27 @@
/*RXDE*/ 0x5 0x4>;
};
+ /* SATA DWC devices */
+ SATA0: sata@bffd1000 {
+ compatible = "amcc,sata-apm821xx";
+ reg =<4 0xbffd1000 0x800 /* SATA0 */
+ 4 0xbffd0800 0x400>; /* AHBDMA */
+ dma-channel=<0>;
+ interrupt-parent =<&UIC0>;
+ interrupts =<26 4 /* SATA0 */
+ 25 4>; /* AHBDMA */
+ };
+
+ SATA1: sata@bffd1800 {
+ compatible = "amcc,sata-apm821xx";
+ reg =<4 0xbffd1800 0x800 /* SATA1 */
+ 4 0xbffd0800 0x400>; /* AHBDMA */
+ dma-channel=<1>;
+ interrupt-parent =<&UIC0>;
+ interrupts =<27 4 /* SATA1 */
+ 25 4>; /* AHBDMA */
+ };
+
So, this is dual SATA controller, not dual port SATA controller?
BTW, it's wrong to have the same AHBDMA resource in two device nodes I
think.
MBR, Sergei
Can you get rid of the following? It looks stupid when you post to the
maliing list.
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